/* 主轴居中 */
.row-justify-content {
  display: flex;
  justify-content: center;
}
.row-column-center {
  display: flex;
  justify-content: center;
  align-items: center;
}
/* 两端对齐 */
.row-space-between {
  display: flex;
  justify-content: space-between;
}
/* 两侧空隙相等 */
.row-space-around {
  display: flex;
  justify-content: space-around;
}
/* 均匀分布 */
.row-space-evenly {
  display: flex;
  justify-content: space-evenly;
}
/* 切换 */
.flex-column {
  flex-direction: column;
}
/* 侧轴居中 */
.align-items {
  align-items: center;
  display: flex;
}
/* 两端对齐 */
.column-space-between {
  display: flex;
  justify-content: space-between;
  flex-direction: column;
}
